Download Advanced PHP Programming by George Schlossnagle PDF

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The following example illustrates how static properties work: class TestClass { public static $counter; } $counter = TestClass::$counter; 41 42 Chapter 2 Object-Oriented Programming Through Design Patterns If you need to access a static property inside a class, you can also use the magic keywords self and parent, which resolve to the current class and the parent of the current class, respectively. Using self and parent allows you to avoid having to explicitly reference the class by name. You have already seen _ _construct(), which is automatically called when an object is instantiated.

Using PPP binds you to this agreement and ensures that only public methods are used by external code, regardless of the temptation to shortcut. Static (or Class) Attributes and Methods In addition, methods and properties in PHP can also be declared static. , an object). Static methods are called using the syntax ClassName::method(). Inside static methods, $this is not available. This means that when it is changed, its change is reflected in all instances of the class. The following example illustrates how static properties work: class TestClass { public static $counter; } $counter = TestClass::$counter; 41 42 Chapter 2 Object-Oriented Programming Through Design Patterns If you need to access a static property inside a class, you can also use the magic keywords self and parent, which resolve to the current class and the parent of the current class, respectively.